JP2023158257A - Reverse flow suppressing joint and drain piping system thereof - Google Patents

Abstract

To provide a reverse flow suppressing joint mountable to a vertically standing drain piping in building foundations, allowing easy inside inspection and maintenance like sweeping, and a drain piping system having the reverse flow suppressing joint.MEANS FOR SOLVING THE PROBLEM: There is provided a reverse flow suppressing joint which has a joint body having an inflow port, an outflow port and an inspection port arranged between the inflow port and the outflow port, a lid part detachably mounted to the inspection port, a valve seat part provided inside the joint body, and a valve element rotatably provided at an upper part of the valve seat part, wherein an outflow port center axis is arranged orthogonal to a center axis of the inflow port. A drain piping system which has the reverse flow suppressing joint is also provided.SELECTED DRAWING: Figure 5

Description

The present invention relates to a backflow prevention joint that can be attached to a drain pipe that has a vertically rising part in a building foundation, etc., and a drainage pipe system thereof, and in particular, the present invention relates to a backflow prevention joint that can be attached to a drain pipe that has a vertically rising part in a building foundation, etc., and a drainage pipe system thereof. The present invention relates to a backflow prevention joint that can be easily attached even to a drain pipe having a vertically rising portion by arranging the same, and a drain pipe system thereof.

Generally, wastewater discharged from drainage equipment in toilets, bathrooms, kitchens, etc. in residential buildings is collected into drainage basins installed within the residential area via drain pipes connected to each drainage equipment, and then collected into drainage basins installed in the residential area. The collected wastewater is discharged into the sewer mains via public squares and manholes.

In addition, in order to prevent backflow water generated from downstream drainage equipment such as main sewer pipes from entering the house, for example, use drainage basins such as those described in Japanese Patent Application Laid-Open No. 2020-153508 (Patent Document 1). A backflow prevention device to be attached, and a backflow prevention valve to be attached to the middle or end of a drain pipe, etc. as described in JP 2021-169701A (Patent Document 2) and JP 2002-294780A (Patent Document 3). is being developed.

On the other hand, due to the frequent occurrence of abnormal weather caused by global warming in recent years, large amounts of rainwater are frequently flowing into the main sewer pipes in a short period of time. There is an increasing need to install backflow prevention devices in drainage pipes, etc. In addition, in-home drainage pipes are usually smaller in diameter than downstream drainage pipes and are more likely to become clogged with sludge, dirt, etc., so it is necessary to deal with this problem.

For this reason, even backflow prevention devices installed in drainage pipes in the house are equipped with an inspection port as described in, for example, Japanese Patent Laid-Open No. 2010-275763 (Patent Document 4), so that maintenance such as inspection and cleaning can be performed. A drainage trap (backflow prevention device) has been developed.

Japanese Patent Application Publication No. 2020-153508 Japanese Patent Application Publication No. 2021-169701 JP2002-294780A Japanese Patent Application Publication No. 2010-275763

However, the backflow prevention devices described in Patent Documents 1 to 4 mentioned above are horizontal backflow prevention devices that are intended to be installed horizontally (horizontally) in a drain pipe or the like arranged substantially horizontally. For this reason, for example, for a drain pipe that has a vertically rising part in a building foundation, etc., if a horizontal part is not provided in the drainage route by connecting a drainage basin or a 90° elbow, Patent Documents 1 to 4 There was a problem in that the described backflow prevention device could not be attached (see FIGS. 2 and 4 of Patent Document 2 and FIG. 3 of Patent Document 3).

Furthermore, although the drainage trap described in Patent Document 4 is provided with an inspection port for maintenance, the internal structure of the valve body is extremely complicated, as the valve body is supported by a mounting seat provided inside the drainage trap. Therefore, there is a problem in that even if the cap member (inspection lid) is actually removed, the interior of the drain trap cannot be easily inspected or cleaned.

Therefore, the present invention enables installation of a drain pipe having a vertically rising part in a building foundation, etc., without connecting a drainage basin or a 90° elbow, and also allows for maintenance such as internal inspection and cleaning. It is an object of the present invention to provide a backflow prevention joint that can be easily performed and a drain pipe system equipped with the backflow prevention joint.

The inventors of the present invention have conducted extensive studies on the layout characteristics of drain pipes having vertically rising portions in building foundations, etc., and the internal structure of backflow prevention joints. As a result, if a check valve and its valve seat can be provided inside a joint in which an inspection port is provided and the central axis of the outflow port and the central axis of the inflow port are arranged orthogonally to each other, the above problem can be solved. We have found that this problem can be solved, and have completed the present invention.

Additionally, if a check valve is installed inside a joint where the center axis of the outflow port and the center axis of the inlet are perpendicular to each other, there will usually be a portion that interferes with the inside of the joint within the locus of rotation of the check valve. It has been found that there are cases where the check valve cannot be rotated sufficiently. Therefore, it has been discovered that the above problem can be effectively solved by widening the interference part in the joint and forming the inspection port so as to bulge outward from the joint body, and the present invention has been completed. I was able to increase the level even further.

That is, according to the present invention, there is provided a joint main body having an inlet, an outlet, and an inspection port disposed between the inlet and the outlet, a lid detachably attached to the inspection port, and a joint body. In a backflow prevention joint that includes a valve seat provided inside the main body and a valve body rotatably disposed above the valve seat, the central axis of the outflow port is the same as the central axis of the inflow port. A backflow prevention joint is provided which is characterized in that it is disposed orthogonally to the joint.

Therefore, since the backflow prevention joint of the present invention has an outlet disposed in the vertical direction, the drainage basin can be used at a 90° Can be easily installed without connecting the elbow. Furthermore, since the backflow prevention joint of the present invention includes a valve seat inside the joint and a valve body rotatably supported by the valve seat, it is easy to install a conventional horizontal backflow prevention device. There is no need to provide a horizontal section in the drainage route.

Note that "vertical" in this specification does not only mean the vertical direction in a strict sense, but also includes a direction in which drainage water can fall directly below. Moreover, "horizontal" in this specification does not only mean horizontal direction in a strict sense, but also generally includes a small slope necessary for flowing wastewater in a horizontal direction.

In the backflow prevention joint of the present invention, it is preferable that the central axis of the inspection port is arranged parallel to the central axis of the outflow port, and the central axis of the inspection port moves away from the inflow port toward the center of the outflow port. More preferably, it is arranged offset (eccentrically) from the axis.

By arranging the center axis of the inspection port parallel to the center axis of the outflow port, the inspection port is oriented upward, making maintenance such as inspection and cleaning of the inside of the joint easier, and backflow water is directed away from the inspection port. Effectively prevents overflow.

In addition, by arranging the center axis of the inspection port offset (eccentrically) with respect to the center axis of the outlet, the rotation range of the valve body suspended inside the joint is expanded, so the valve body is The body can maintain a sufficiently open state due to its own weight, which prevents clogging of the backflow prevention joint due to sludge, dirt, etc. Furthermore, since the inspection port can be formed to bulge outward from the joint body, access to the inside of the joint through the enlarged inspection port becomes easy.

In the backflow prevention joint of the present invention, it is preferable that the joint main body has a downwardly curved bent pipe portion communicating with the inflow port, and the valve seat portion is formed at an end of the bent pipe portion.

By providing a bent pipe inside the joint body, not only can the waste water flowing into the joint from the inlet be smoothly deflected downward, but the shape of the valve body can also be approximately circular to match the shape of the valve seat. It can be simplified as follows.

In the backflow prevention joint of the present invention, the valve body may be rotatably supported by the lid.

When the valve body is attached to the lid of the inspection port, when the lid is removed, the valve body is also removed. It can be made into a hollow state. Therefore, maintenance such as inspection and cleaning of the interior of the joint can be easily performed even in a narrow space.

In the backflow prevention joint of the present invention, it is preferable that the lid part is composed of a lid main body for opening and closing the inspection port, and a cap part for supporting the valve body. More preferably, it is rotatable in the circumferential direction.

When the lid is composed of the lid main body and the cap as described above, the cap is placed on the inner circumferential surface of the inspection port in the circumferential direction so that the valve body can be easily set in the specified position. It is preferable to provide a first fitting part that is unrotatably supported from below on the cap part, and to provide a second fitting part that fits into the first fitting part in the cap part.

If the locking means of the lid part is a bayonet mechanism, by coordinating the lid body with the inspection port, it is possible not only to prevent the lid from easily coming off from the inspection port, but also to prevent the lid from easily separating from the inspection port. Since the fitting part can be sandwiched between the lid main body and the first fitting part of the inspection port without causing rattling or rotation, the valve body supported by the cap part can be accurately held in the predetermined position. It is possible to make accurate contact with the valve seat.

Further, when the valve body is attached to the lid, if the lid comes off from the inspection port for some reason, the valve body will come off along with it, making it impossible to prevent backflow. For this reason, it is preferable that the backflow prevention joint of the present invention has a locking means to prevent the lid from coming off from the inspection port due to an increase in the pressure of water or air inside the joint. In this case, the locking means may be a bayonet mechanism that prevents the lid from coming off the inspection port by rotating the lid body in the circumferential direction relative to the inspection port, for example.

In the present invention, a first drain pipe opens sideways and extends substantially horizontally indoors or from the indoors to outdoors, and a second drain pipe opens upwards and rises vertically from underground or from the building foundation. In a drain pipe system comprising a drain pipe, the above-described backflow prevention joint of the present invention is disposed between the first drain pipe and the second drain pipe, and the first drain pipe and the second drain pipe and can be connected to.

Therefore, according to the present invention, even in a drain pipe having a vertical rising part, it is possible to configure a drain pipe system that has a backflow prevention function in the rising part, and it is possible to configure a drain pipe system with a backflow prevention function in the rising part, and to use pipes such as drain squares and 90° elbows. The number of parts can be reduced.

The backflow prevention joint of the present invention includes a joint body having an inflow port, an outflow port, and an inspection port disposed between the inflow port and the outflow port; In a backflow prevention joint that includes a valve seat provided inside the main body and a valve body rotatably disposed above the valve seat, the central axis of the outflow port is the same as the central axis of the inflow port. A backflow prevention joint is provided that is disposed orthogonally to the.

Therefore, according to the present invention, the backflow prevention joint can be easily attached to a drain pipe having a vertically rising part in a building foundation, etc., and the valve seat and the valve seat are provided inside the joint. Since the valve body is rotatably supported on the seat, there is no need to provide a horizontal portion in the drainage path unlike when installing a conventional horizontal backflow prevention device.

In the backflow prevention joint of the present invention, the central axis of the inspection port may be arranged parallel to the central axis of the outflow port, and the central axis of the inspection port may be moved away from the inflow port to the center of the outflow port. It may also be arranged offset (eccentric) from the axis.

Therefore, according to the present invention, the inspection port is arranged upward, which facilitates maintenance such as inspection and cleaning of the inside of the joint, and also effectively prevents backflow water from overflowing from the inspection port. can. Furthermore, since the rotation range of the valve body suspended inside the joint is expanded, it is also possible to prevent the backflow prevention joint from becoming clogged with sludge, dirt, or the like. Furthermore, since the inspection port can be formed to bulge outward from the joint body, access to the inside of the joint through the enlarged inspection port becomes easy.

In the backflow prevention joint of the present invention, the joint main body has a downwardly curved bent pipe portion communicating with the inflow port, and the valve seat portion may be formed at an end of the bent pipe portion.

Therefore, according to the present invention, not only can the drainage water flowing into the joint from the inlet be smoothly deflected downward, but also the shape of the valve body can be simplified to a substantially circular shape to match the shape of the valve seat. become able to.

In the backflow prevention joint of the present invention, it is possible to provide a backflow prevention joint in which the valve body is rotatably supported by the lid.

Therefore, according to the present invention, when the lid is removed, the valve body is also removed, and after the valve body is removed, the inside of the joint is essentially a cavity without walls or other parts forming unevenness. Therefore, maintenance such as inspection and cleaning of the interior of the joint can be easily performed even in a narrow space.

It is a perspective view showing the whole backflow prevention joint concerning a 1st embodiment of the present invention. FIG. 2 is a side view of the backflow prevention joint shown in FIG. 1; FIG. 2 is a front view of the backflow prevention joint shown in FIG. 1; FIG. 2 is a plan view of the backflow prevention joint shown in FIG. 1; FIG. 5 is a cross-sectional view of the backflow prevention joint shown in FIG. 4 taken along the line AA. FIG. 2 is a perspective view showing the entire lid and valve body of the backflow prevention joint according to the first embodiment of the present invention. FIG. 7 is a front view of the lid and valve body shown in FIG. 6; FIG. 7 is a side view of the lid and valve body shown in FIG. 6; FIG. 7 is an exploded view of the lid and valve body shown in FIG. 6; It is a perspective view which shows the whole cover part and valve body of the backflow prevention joint based on the 2nd Embodiment of this invention. 11 is a front view of the lid and valve body shown in FIG. 10. FIG. 11 is a side view of the lid and valve body shown in FIG. 10. FIG. FIG. 2 is a sectional view showing a mode in which the backflow prevention joint according to the first embodiment is connected to a drain pipe that stands up vertically outside the building foundation. FIG. 2 is a partial cross-sectional view showing a mode in which the backflow prevention joint according to the first embodiment is connected to a drain pipe that stands up vertically within a building foundation.

Hereinafter, a backflow prevention joint according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments shown below, and various changes can be made without departing from the technical idea of the present invention.

[First embodiment]
<Joint body>
FIG. 1 shows an overall perspective view of a backflow prevention joint 1 according to a first embodiment of the present invention. Further, FIG. 2 shows a side view of the backflow prevention joint 1 shown in FIG. 1, and FIG. 3 shows a front view of the backflow prevention joint 1 shown in FIG. FIG. 4 shows a plan view of the backflow prevention joint 1 shown in FIG. Further, FIG. 5 shows a cross-sectional view of the backflow prevention joint 1 shown in FIG. 4 taken along the line AA.

As shown in FIGS. 1 to 4 and 5, the backflow prevention joint 1 of the first embodiment mainly includes a substantially cylindrical joint body 2, a lid portion 3, and a valve body 4 attached to the lid portion 3. (See FIG. 5). The joint body 2 has an inlet 20, an outlet 21, a bent pipe portion 22 communicating with the inlet 20, and an upwardly opened inspection port 23, which are integrally formed. There is. Although vinyl chloride resin is used as the material for the joint body 2, the material to be used is not particularly limited, and generally known materials such as plastics can be used.

As understood with reference to FIG. 5, the inlet 20 and the outlet 21 of the joint body 2 have a socket shape, and therefore, there is no space inside the inlet 20 and the outlet 21 for connection. Stepped portions 200 and 210 are formed that function as stoppers when the distal end of the drain pipe comes into contact with them. Further, in this embodiment, the inlet 20 and the outlet 21 have a socket shape, but the inlet 20 and/or the outlet 21 may have a spigot shape (not shown).

The inspection port 23 of the joint body 2 has a body part 230 that has approximately the same width as the curved pipe part 22 and rises upward. It is formed to bulge out. Moreover, a cylindrical receiving part 231 having a step 232 therein for continuously and removably supporting the lid part 3 is formed in the upper part of the body part 230. Therefore, even if the diameter of the receiving portion 231 is different from the diameter of the bent pipe portion 22, the inspection port 23 (receiving portion 231) is bent by expanding or contracting the diameter at the boundary between the receiving portion 231 and the body portion 230. Regardless of the diameter of the pipe portion 22, the opening diameter necessary for inspecting the inside of the backflow prevention joint 1 can be secured. Furthermore, a recess 233 is formed on the inner circumferential surface of the inspection port 23 as a first fitting part for supporting the lid part 3 from below without being able to rotate in the circumferential direction (see FIGS. 1 to 3). ).

In the present embodiment, the bent pipe portion 22 is formed to protrude downward toward the inside of the joint body 2 from an inlet 20 provided in a common side wall of the joint body 2 and the body portion 230 (Fig. (see 5). A valve seat portion 24 is formed at the outlet end of the bent pipe portion 22 and functions to cooperate with the valve body 3 to prevent backflow water by coming into contact with the valve body 3. . Further, a step portion 240 connected to the inner wall surface of the joint body 2 is formed at the lower part of the valve seat portion 24, and the valve seat portion 24 is formed by the outlet end of the curved pipe portion 22 including the step portion 240. It is provided so as to form a substantially circular contact surface.

Therefore, in this embodiment, when the outflow port 21 of the backflow prevention joint 1 is connected to a drain pipe having a vertical rising part (see FIGS. 13 and 14), the outlet end of the bent pipe part 22 is Utilizing this, a valve seat portion 24 is formed inside the joint body 2, which is inclined from the downstream side to the upstream side as it goes from the top to the bottom. Furthermore, when the valve seat portion 24 is tilted as described above, a gap is formed between the valve body 4, which is normally suspended due to its own weight, and the valve seat portion 24, so that the smooth flow of normal flow drainage is achieved. Since the valve body 4 comes into contact with the valve seat 24 only in abnormal situations (when water rises), backflow of water can be effectively suppressed.

In addition, in the joint body 2, a downwardly curved ceiling part 25 is formed in the upper half of the bent pipe part 22, so that the drainage flowing into the joint body 2 from the inlet 20 can be smoothly directed downward. Not only can the valve body 4 be deflected to the direction shown in FIG.

In addition, in this embodiment, the ceiling part 25 is integrally formed as a part of the curved pipe part 22, but it may be constructed as a separate and independent part from the curved pipe part 22, or it may be formed as a separate and independent part from the curved pipe part 22. 22 itself may be configured as an independent component separated from the joint body 2.

Alternatively, the ceiling portion 25 may be supported by the lid portion 3, and the valve body 4 may be rotatably supported above the end portion (valve seat portion 24) of the ceiling portion 25. Furthermore, although not shown, in this embodiment, it is not necessary to provide the bent pipe part 22 and the ceiling part 25 inside the joint body 2, and by matching the shape of the valve body to the shape of the valve seat part, the valve seat part ( For example, a stepped portion) may be provided directly on the inner circumferential surface of the joint body 2.

In the backflow prevention joint 1 of this embodiment, the central axis b of the outflow port 21 is disposed perpendicular to the central axis a of the inflow port 20. Therefore, if the outflow port 21 of the joint body 2 is connected to a drain pipe having a vertically rising portion, the inflow port 20 is arranged horizontally, so that it can be easily connected to the drain pipe 5 arranged approximately horizontally. (See Figures 13 and 14).

In this embodiment, the central axis c of the inspection port 23 is arranged parallel to the central axis b of the outlet 21, and furthermore, in this embodiment, the central axis c of the outlet 21 is arranged in a direction away from the inlet 20. (see FIGS. 13 and 14). Therefore, the inspection port 23 is arranged upward, and unlike conventional horizontal backflow prevention devices, the drainage inside the joint does not easily overflow even when the lid 3 is opened, and the lid 3 can be removed easily. For example, the inside of the backflow prevention joint 1 can be easily inspected.

In addition, in this embodiment, by arranging the central axis c of the inspection port 23 offset (eccentrically) with respect to the central axis b of the outlet 21, the valve body 4 suspended inside the joint body 2 is Since the rotation range is expanded, the valve body 4 can be kept in a sufficiently open state due to its own weight under normal conditions, and the backflow prevention joint 1 can be prevented from being clogged with sludge, dirt, etc. Furthermore, since the inspection port 23 can be formed so as to bulge outward from the joint body 2, access to the inside of the joint body 2 through the enlarged inspection port 23 becomes easy.

<Lid part>
FIG. 6 shows a perspective view showing the entire cover portion 3 and valve body 4 of the backflow prevention joint 1 according to the first embodiment of the present invention. 7 shows a front view of the lid 3 and valve body 4 shown in FIG. 6, and FIG. 8 shows a side view of the lid 3 and valve body 4 shown in FIG. is shown, and FIG. 9 shows an exploded view of the lid portion 3 and valve body 4 shown in FIG. 6. In addition, in FIGS. 6 to 9, the state in which the valve body 4 is intentionally tilted is shown for ease of understanding, but in reality, when there is no load, the valve body 4 is tilted approximately vertically due to its own weight. It will be in a suspended state.

As shown in FIG. 5 and FIGS. 6 to 9, the lid portion 3 has a thick, approximately disk-like shape, and a valve body 4 is mounted on the lower surface of the lid portion 3 via a support arm 32 extending downward. It is rotatably supported. Further, a pair of convex portions 300 for gripping and rotating the lid portion 3 are formed on the upper surface of the lid portion 3. Although vinyl chloride resin is used as the material for both the lid portion 3 and the valve body 4, there is no particular limitation on the material used, and known materials such as plastics can mainly be used.

More specifically, as shown in FIG. 9, the lid 3 has a convex portion 300 formed on its upper surface, a lid main body 30 for opening and closing the inspection port 23, and a lower part of the lid main body 30. The support arm 32 is formed integrally with the cap 31 and extends downward from the lower surface of the cap 31.

Further, a cylindrical ring 311 is provided on the upper surface of the cap 31 to make it easier to grasp the cap 31, and a recess shape provided on the inner peripheral surface of the above-mentioned inspection port 23 is provided on the lower surface of the cap 31. A pair of leg portions 310 as second fitting portions that can be fitted with the first fitting portion 233 and are arranged at positions facing each other are provided on the peripheral edge. That is, in this embodiment, the lid main body 30 and the cap 31 are configured as separate and independent parts, and the lid main body 30 is rotatable in the circumferential direction with respect to the cap 31.

Further, a groove 301 is formed in the side surface (circumferential surface) of the lid main body 30, and a packing 33 made of an elastomer material is fitted into the groove 301 to improve sealing performance with the inspection port 23. (See Figure 5). In this embodiment, the lid 3 is composed of a lid main body 30 and a cap 31 with a support arm 32 as separate and independent parts, but it may be formed as an integral part.

In the backflow prevention joint 1 of this embodiment, when closing the inspection port 23, the pair of legs 310 of the cap 31 are first fitted into the pair of recesses 233 provided inside the inspection port 23. By fitting the legs 310 and the recess 233, the cap 31 that supports the valve body 4 is supported from below by fitting the recess 233, and is set so as not to rotate in the circumferential direction. After setting the cap 31 inside the inspection port 23, the lid main body 30 is placed on the step 232 of the receiving portion 231 of the inspection port 23, so that the cap 31 and the lid main body 30 can be inspected together. Since the valve element 4 supported by the cap part 31 is sandwiched between the concave part 233 of the mouth so as not to rattle or rotate, the valve element 4 supported by the cap part 31 is accurately set at a predetermined position and accurately abuts against the valve seat part 24. It becomes possible to do so.

Note that when opening the inspection port 23, the valve body 4 can also be easily removed by removing the lid body 30 and the cap portion 31 from the inspection port 23 in the reverse procedure to the above-described procedure. Moreover, if the lid body 30 and the cap 31 are integrally formed, when the lid 3 is removed from the inspection port 23, the valve body 4 can also be removed together.

As shown in FIGS. 1, 2, 4, and 6, in the backflow prevention joint 1 of this embodiment, the lid portion 3 is unexpectedly separated from the inspection port 23 due to an increase in the pressure of water or air inside the joint 1. A locking means 7 is provided to prevent this. In this embodiment, it is preferable that the locking means 7 is a bayonet mechanism that prevents the lid part 3 from coming off from the inspection port 23 by rotating the lid main body 30 in the circumferential direction with respect to the inspection port 23. More specifically, the locking means 7 includes a pair of crank-shaped protrusions 70 provided on the side surface (circumferential surface) of the lid main body 30 of the lid 3 at opposing positions that are 180 degrees apart from each other. The receiving portion 231 of the mouth 23 is comprised of a pair of crank-shaped notches 71 provided at opposing positions that are 180 degrees apart from each other.

Therefore, after setting the cap part 31 that supports the valve body 4 inside the inspection port 23 and fitting the cover main body 30 into the receiving part 231 of the inspection port 23, the lid part 3 is assembled with the projection part 70 and the notch. When the cap part 31 is rotated to a position where it engages with the cap part 71, it is easily locked without rotating the cap part 31, and the cap part 31 is held down to prevent rattling while preventing accidental detachment from the inspection port 23. I can do it. In the bayonet mechanism described above, the notch 71 does not need to be a crank-shaped protrusion, and may simply be a rod-shaped protrusion. Furthermore, the locking means 7 does not necessarily have to be a bayonet mechanism, and in particular when the lid main body 30 and the cap 31 are integrally formed, a known method such as a hook that locks the lid 3 from above may be used. It is also possible to use other engagement means.

<Valve body>
As shown in FIGS. 5 to 8, in this embodiment, the valve body 4 has a flat disk shape, and is rotatably supported by the support arm 32 of the lid portion 3. As shown in FIGS. Further, the valve body 4 is rotatably moved to a position in contact with the upper part of the end of the bent pipe part 22 (ceiling part 25) provided inside the joint body 2, that is, in a position in contact with the upper part of the valve seat part 24. Placed.

Although not shown, the fulcrum of the valve body 4 normally holds the valve body 4 in a vertically suspended position (FIG. 5) or in a position tilted toward the valve seat 24 from the vertical direction, and at least A stopper may be provided to prevent the valve 4 from rotating in the direction away from the valve seat portion 24 from the vertical direction. In addition, in order to hold the valve body 4 in a position tilted toward the valve seat 24 from the vertical direction, a protrusion like a support rod that comes into contact with the surface of the valve body 4 is provided inside the joint body 2. It's okay.

As mentioned above, if a stopper is provided at the fulcrum of the valve body 4, the valve body cannot rotate from the vertical direction away from the valve seat 24 in the event of an abnormality (when water rises), so the valve body cannot rotate from the bottom to the top. It becomes possible to reliably rotate the valve body 4 toward the valve seat portion 24 side against the rising backflow water. In addition, when the valve body is held in a position tilted from the vertical direction toward the valve seat 24 by the stopper on the fulcrum or the protrusion inside the joint body 2, the backflow water rising from the bottom to the top will be absorbed by the tilted valve body 2. Since the valve body 4 collides obliquely with respect to the valve seat 24, it is possible to reliably rotate the valve body 4 toward the valve seat portion 24 in this case as well.

[Second embodiment]
<Valve body>
In the backflow prevention joint 1a according to the second embodiment of the present invention, the configurations of the joint body and the lid other than the valve body 4a and the effects produced thereby are the same as those in the backflow prevention joint 1 according to the first embodiment described above. The configurations of the joint body 2 and the lid part 3 and the effects achieved thereby are all the same, so a detailed explanation will be omitted here. Therefore, the reference numerals in the drawings regarding the joint main body 2 and the lid portion 3 of the backflow prevention joint 1a are the same as the reference numerals in the drawings regarding the backflow prevention joint 1.

FIG. 10 is a perspective view showing the entire cover portion 3 and valve body 4a of a backflow prevention joint 1a according to a second embodiment of the present invention. Further, FIG. 11 shows a front view of the lid 3 and valve body 4a shown in FIG. 10, and FIG. 12 shows a side view of the lid 3 and valve body 4a shown in FIG. It is shown. In addition, in FIGS. 10 to 12, the state in which the valve body 4a is intentionally tilted is shown for ease of understanding, but in reality, in the case of no load, the valve body 4a is tilted approximately vertically due to its own weight. It will be in a suspended state.

In this embodiment, the valve body 4a (check valve) is reliably closed even against the flow of backflow water that rises from the bottom to the top, which is unique to backflow prevention joints arranged in the vertical direction. As such, the valve body 4a is provided with a rotation trigger means 8a that rotates the valve body 4a toward the valve seat portion 24 due to the rise of backflow water inside the backflow prevention joint 1.

In this embodiment, the rotation trigger means 8a is formed in the lower region of the valve body 4a by bending the middle of the flat disk-shaped valve body 4a into a “dog-shaped” shape when viewed from the side (FIG. 12). The inclined portion 80a is configured as a curved inclined portion 80a. More specifically, under normal conditions, the inclined portion 80a extends away from the rotation axis (fulcrum 40a) of the valve body 4a from a vertical plane passing through the rotation axis (fulcrum 40a) of the valve body 4a toward the valve seat portion 24 side. It is configured as an inclined surface formed so as to be inclined.

Further, the inclined portion 80a is fixed to a portion of the valve body 4a other than the inclined portion 80a (the upper region of the valve body 4a) so as to maintain the entire valve body 4a in a certain “dog-shaped” form. It may be connected or integrally formed so that it is, or it may be connected so as to be bendable (rotatable) to a portion other than the inclined portion 80a. When the valve body 4a is made bendable as described above, the movable range of the slope part 80a with respect to the portion other than the slope part 80a is a state in which it is opened 180 degrees so as to form the same plane as the upper area of the valve body 4a (for example, (see Fig. 8), the valve body 4a can be bent to a certain bending angle in a “dog-shaped” state (Fig. 12), and the valve body 4a can be bent to an angle smaller than the certain bending angle. It is preferable to regulate.

Further, when the valve body 4a is made to be bendable in a “dog-shaped” shape as described above, when the valve body 4a abuts against the valve seat portion 24, the valve body 4a is bent like the valve body of the first embodiment. Since the valve seat 24 has a flat disk shape as shown in FIG. 4, the shape of the valve seat portion 24 can also be made substantially circular to match the outer contour of the valve body 4a. On the other hand, when the valve body 4a is fixed in a “dog-shaped” shape, the shape of the valve seat portion 24 is also bent in a “dog-shaped” shape to match the outer contour of the “dog-shaped” valve body 4a. Must be.

In addition, in this embodiment, the inclined part 80a does not necessarily have to be an inclined plane, and in normal times, as it moves away from the rotational axis (fulcrum 40a) of the valve body 4a, it passes through the rotational axis (fulcrum 40a) of the valve body 4a. If it is formed to be inclined from the vertical plane toward the valve seat portion 24 side, for example, the inclined surface formed in the lower region of the valve body 4a that bulges conically from the downstream side to the upstream side (Fig. (not shown).

In this embodiment, since the inclined portion 80a is provided on the valve body 4a as described above as the rotation trigger means 8a of the valve body 4a, backflow can be prevented by connecting the backflow prevention joint 1 to a vertically rising pipe. Even if water rises in the joint body 2 from the bottom to the top, the backflow water will collide with the inclined part 80a in an oblique direction, so that the backflow water will surely reach the valve body 4a on the valve seat part 24 side. As a result, malfunction of the backflow prevention valve (valve body 4a) can be prevented.

Further, although not shown, in this embodiment, the rotation trigger means 8a is a buoyancy generating part with a specific gravity smaller than the water attached to the valve bodies 4, 4a, and in normal times, the buoyancy generating part is attached to the valve bodies 4, 4a. It can also be configured by arranging it closer to the valve seat portion 24 than the vertical plane passing through the rotation axis (fulcrums 40, 40a).

If the buoyancy generating part is arranged eccentrically toward the valve seat side from the vertical plane passing through the rotation axis (fulcrum 40, 40a) of the valve bodies 4, 4a as described above, backflow water rising from the bottom to the top. As a result, the valve bodies 4, 4a can be rotated toward the valve seat portion 24 side, and the buoyancy generating portion can be raised so as to be pulled up.

[Example of installing backflow prevention joint]
FIG. 13 shows a drain pipe system 10 according to an embodiment of the present invention, in which a backflow prevention joint 1 according to the first embodiment is connected to a drain pipe 6 that stands up vertically outside a building foundation 11 and a building foundation. 11 is shown, and FIG. 14 shows a drain pipe system 10a according to another embodiment of the present invention, in which the first A mode in which the backflow prevention joint 1 according to the embodiment is connected to a drain pipe 6a that penetrates a building foundation 11a and stands up vertically within the foundation 11a, and a drain pipe 5a that is arranged horizontally within the building foundation 11a. A partial cross-sectional view is shown. In addition, in FIGS. 13 and 14, even if the backflow prevention joint 1 according to the first embodiment is replaced with the backflow prevention joint 1a according to the second embodiment, the connection mode and effect will be the same as the backflow prevention joint 1a according to the first embodiment. Since this is the same as when using the deterrent joint 1, detailed explanation will be omitted here.

As shown in FIG. 13, in the drain pipe system 10 of this embodiment, the drain pipe 6 on the downstream side rises vertically from the ground 90 outside the building foundation 9 made of concrete. Although not shown, the downstream drain pipe 6 is usually collected in a drainage basin in a residential area and connected to a main sewer pipe via a public basin or manhole. On the other hand, within the building foundation 9, the upstream drain pipe 5 is arranged approximately horizontally. Although not shown, the upstream drain pipe 5 is usually connected to drainage equipment in a toilet, bathroom, kitchen, etc. within the building.

In the backflow prevention joint 1 of this embodiment, the central axis b of the outflow port 21 is disposed perpendicular to the central axis a of the inflow port 20 (see FIG. 5), so the inspection port 23 of the backflow prevention joint 1 By arranging the joint body 2 so that it faces upward, the outlet 21 of the joint body 2 can be easily connected to the drain pipe 6 on the downstream side, and the inlet 20 can be easily connected to the drain pipe 5 on the upstream side.

As shown in FIG. 14, in the drain pipe system 10a of the present embodiment, a pipe-shaped sleeve bent pipe (sheath pipe) 60a penetrating the building foundation 9a made of concrete and bent at approximately 90 degrees is connected to the foundation 9a. embedded within. In addition, the sleeve bent pipe 60a can be connected to a first socket 61a from the downstream side as a drain pipe constituting the downstream drain pipe 6a. , a flexible tube 62a bent approximately 90 degrees along the sleeve bent tube 60a, a second socket 61a connected to the flexible tube 62a, and a vertical direction connected to the second socket 61a. A short straight pipe 63a forming a raised spout is arranged. Although not shown, the downstream drain pipe 6a is usually collected in a drainage basin in a residential area and connected to a main sewer pipe via a public basin or manhole.

Furthermore, within the building foundation 9a, the upstream drain pipe 5a is arranged approximately horizontally. Although not shown, the upstream drain pipe 5a is usually connected to drainage equipment in a toilet, bathroom, kitchen, etc. within the building.

In the backflow prevention joint 1 of this embodiment, the central axis b of the outflow port 21 is disposed perpendicular to the central axis a of the inflow port 20 (see FIG. 5), so the inspection port 23 of the backflow prevention joint 1 By arranging the joint body 2 so that it faces upward, the outlet 21 of the joint body 2 can be easily connected to the drain pipe 6a on the downstream side, and the inlet 20 can be easily connected to the drain pipe 5a on the upstream side.

As described above, the backflow prevention joint 1 of the present embodiment is capable of connecting a drainage basin or a 90° elbow even to the drainage pipes 6, 6a having vertically rising portions in the building foundations 9, 9a, etc. It can be installed easily without any problems. In addition, the backflow prevention joint 1 of this embodiment includes a valve seat portion 24 inside the joint body 2 and a valve body 4 rotatably supported by the valve seat portion 24, so that it is different from the conventional one. There is no need to provide a horizontal section in the drainage path, unlike when installing a horizontal backflow prevention device.

In addition, in the backflow prevention joint 1 of this embodiment, the valve seat part 24 is formed obliquely using the end of the bent pipe part 22 provided inside the joint body 2, so the outflow port 21 is vertically formed. Even if connected to the standing drain pipes 6, 6a, under normal conditions the valve body 4 (check valve) will be in an open state (suspended state) due to its own weight, and in an abnormal situation, the valve will close due to the rise and collision of backflow water. The body 4 (check valve) can be operated to reliably close.

Furthermore, in the backflow prevention joint 1 of this embodiment, the valve body 4 is attached to the cap portion 31 of the lid portion 3, so that when the cap portion 31 is removed, the valve body 4 is also removed together with the valve body 4. When the lid body 30 and the cap 31 are attached to the lid 3 which is integrally formed, when the lid 3 is removed, the valve body 4 is also removed together. Therefore, in this embodiment, the inside of the backflow prevention joint 1 after the valve body 4 is removed is essentially a hollow state with no walls or other parts forming unevenness, so it can be used even in a narrow space. Maintenance such as inspection and cleaning of the backflow prevention joint 1 can be easily performed.

1, 1a... Backflow prevention joint 10, 10a... Drain pipe system 2... Joint body 20... Inlet 200... Step portion 21... Outlet 210... Step portion 22... Channel portion 23... Inspection port 230... Body portion 231... Receiving portion 232... Step portion 233... First fitting portion (recess)
24... Valve seat part 240... Step part 25... Ceiling part 3... Lid part 30... Lid part body 300... Convex part 301... Groove part 31. ... Cap 310 ... Second fitting part (leg part)
311... Cylindrical ring 32... Support arm 33... Packing 4, 4a... Valve body 40, 40a... Fulcrum 5, 5a... Upstream drain pipe 6, 6a... ...Downstream drain pipe 60a...Sleeve bent pipe (sheath pipe)
61a...Socket 62a...Flexible tube 63a...Straight tube 7...Lock means 70...Protrusion 71...Notch 8a...・Rotation trigger means 80a... Inclined part 9, 9a... Building foundation 90... Ground a, b, c... Central axis

Claims (10)

a joint body having an inlet, an outlet, and an inspection port disposed between the inlet and the outlet;
a lid that is removably attached to the inspection port;
A backflow prevention joint comprising: a valve seat provided inside the joint body; and a valve body rotatably disposed above the valve seat.
A backflow prevention joint characterized in that a central axis of the outflow port is disposed orthogonal to a central axis of the inflow port. The backflow prevention joint according to claim 1, wherein a central axis of the inspection port is arranged parallel to a central axis of the outflow port. 3. The backflow prevention joint according to claim 2, wherein the central axis of the inspection port is offset from the central axis of the outflow port in a direction away from the inflow port. The joint body communicates with the inflow port and has a downwardly curved bent pipe portion,
The backflow prevention joint according to claim 3, wherein the valve seat portion is formed at an end of the bent pipe portion. The backflow prevention joint according to claim 3, wherein the valve body is rotatably supported by the lid. The lid portion includes a lid main body for opening and closing the inspection port, and a cap portion for supporting the valve body, and the lid main body is arranged in a circumferential direction with respect to the cap portion. 6. The backflow prevention joint according to claim 5, wherein the joint is rotatable. A first fitting portion is provided on the inner circumferential surface of the inspection port, and the first fitting portion supports the cap portion from below so as not to be rotatable in the circumferential direction, and the first fitting portion is provided in the cap portion. 7. The backflow prevention joint according to claim 6, further comprising a second fitting portion that fits into the second fitting portion. 8. The backflow prevention joint according to claim 7, further comprising a locking means for preventing the lid from coming off from the inspection port due to an increase in water or air pressure within the joint body. 9. The locking means is a bayonet mechanism that prevents the lid from coming off the inspection port by rotating the lid main body in the circumferential direction relative to the inspection port. Backflow prevention fitting as described. a first drain pipe that opens sideways and extends substantially horizontally indoors or from the indoors to the outdoors;
a second drain pipe that opens upward and rises vertically from underground or from the building foundation; and a second drain pipe that is disposed between the first drain pipe and the second drain pipe, and that is arranged between the first drain pipe and the second drain pipe; and the backflow prevention joint according to any one of claims 1 to 7, which is connected to the second drain pipe.

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